System of electrical distribution.



No. 781,919. PATENTED FEB. 7, 1905.

G. W. STONE.

SYSTEM OF ELECTRICAL DISTRIBUTION.

APPLICATION FILED SEPT. 30, 1901.

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WMQXEKL UNITED STATES CHARLES W. STONE, OF SOHENEOTADY, NEIV YORK,ASSIGNOR TO GEN- Patented February '7, 1905.

PATENT. OEEIcE.

ERAL ELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

SYSTEM OF ELECTRICAL DISTRIBUTION.

SPECIFICATION forming part of Letters Patent No. 781,919, dated F bruary'7, 1905.

Application filed September 30, 1901. Serial No. 77,046.

To all whom it may concern:

Be it known that LOHARLEsW. S'roNE,a citi- Zen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Systems of ElectricalDistribution, of which the following is a specification.

.My present invention relates to circuit-interrupting means for use moreparticularly in connection with multiple-conductor systems of electricaldistribution; and it comprises certain improvements particularly pointedout in the appended claims and set forth in detail in the followingdescription, which for clearness of understanding is to be taken inconnection with the accompanying drawing, which represents in diagramone embodiment of my invention.

In the drawing, 1 represents conventionally any suitable source ofcurrent, from which extend distributing-mains 2 3. A set ofbalancing-machines 4, connected between these mains, provides means fordividing up the electromotive force between the mains and for impressingthe resulting electromotive forces upon cooperating mains 5 6. Thebalancing-machines referred to are represented in the present instanceas consisting of three machines, with their armature-shafts directlyconnected and their armatures 7, S, and 9 in series with each otheracross the mains 2 3. The field-winding of each machine is connected inthe usual manner in shunt to its armature and is provided, if desired,with a current-regulating device, such as a rheostat. From theconnection between the armatures 7 8 and from the connection between thearmatures 8 and 9 extend, respectively, the mains 5 and 6. By suitablyexciting the fields of the machines the respective mains of thedistribution system may be caused to divide up the voltage between theoutside mains in any proportions desired. The manner of accomplishingthis result is well understood in the art.

Each of the mains of the distribution system is providedwithacircuit-breaker responsive to overload. These circuit-breakers areindicated at 10, 11, 12, and 18 and may be of any desired type known tothe art. Each circuit-breaker, however, is provided with twotripping-coils, one a main tripping-coil in series with the main towhich the circuitbreaker is connected and the other an auxiliarytripping-coil. The main tripping-coils are indicated, respectively, at14, 15, 16, and

17 and the auxiliary tripping-coils at 18, 19, 20, and 21. Eachcircuit-breaker is also provided with a circuit-closing device whichoperates upon tripping of the circuit-breaker. The two terminals of eachcircuit-closing device are connected, respectively, to a pair of omnibusleads, which leads are connected across a suitable source of current.The omnibus leads above referred to are represented at 22 and 23. One ofthese leads to wit, the lead 22*is connected to the outside main 2 ofthe distribution system, while the other lead, 23, is connected inseries with all of the auxiliary tripping-coils 18, 19, 20, and 21 ofthe four circuit-breakers and then to the other outside) main 3 of thedistribution system.

The circuit-closing device forming part of each circuit-breaker may bearranged in any one of a large variety of ways. I have, however, forpurposes of illustration represented one such arrangement in thedrawings. This consists of two fixed contacts 24 25, with whichcooperates a V-shaped bridging-contact 26, connected by a rod to theknee of the toggle-joint of the circuit-breaker. The arrangement thusdescribed in connection with the circuit-breaker 10 may be duplicated inthe remaining circuit-breakers, as shown.

hen the current in any one of the mains of the distribution systemexceeds an amount for which the circuit-breaker for that main may beset, the series tripping-coil of that circuit-breaker by reason of theexcessive current then flowing therein opens the circuit of that main.By the tripping operation the circuit closing device of thecircuitbreaker closes the circuit between the omnibus Ieads 22 23,thereby energizing the auxiliary tripping-coils of all of the circuitbreakers, thereby causing all of the remaining circuit-breakers to trip,and so open-circuiting all of the remaining mains of the distributionsystem.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The combination of a multiple-conductor system of distribution, acircuit-breaker for each main conductor, a circuit-closing device foreach circuit-breaker, omnibus leads adapted to be connected by any oneof said circuit-closing devices, an auxiliary trippingcoil for eachcircuit-breaker, a connection between one of said omnibus leads and oneterminal of a source of current, and a connection from the other omnibuslead through all of said auxiliary tripping-coils to the other terminalof said source of current.

2. The combination of a multiple-conductor system of electricaldistribution, a plurality of circuit-breakers, each for a conductor ofsaid system, and a tripping-circuit for all the circuit-breakersenergized by the tripping of one of said circuit-breakers.

3. The combination of a source of current, mains extending therefrom, aset of balancingmachines connected between said mains, other mainsextending from connections between said balancing-machines, acircuit-breaker for each main, an auxiliary tripping-coil for eachcircuit-breaker, and means operative upon the tripping of any onecircuit-breaker for energizing the auxiliary tripping-coils of all ofthe circuit-breakers.

4. The combination of a multiple-conductor distribution system, acircuit-breaker for each conductor having a main tripping-coilresponsive to overload in that conductor, an auxiliary tripping coil foreach circuitbreaker, and means responsive to the tripping of any onecircuit-breaker for energizing the auxiliary trippingcoils of all thecircuitbreakers.

5. The combination of a plurality of conductors of the same systemmaintained at different potentials, a circuit-breaker in series witheach of a plurality of said conductors, a main tripping-coil and anauxiliary trippingcoil for each circuit-breaker, and means responsive tothe tripping of any one circuitbrealrer for energizing the auxiliarytrippingcoils of all the circuit-breakers.

In witness whereof l have hereunto set my hand this 28th day ofSeptember, 1901.

CHARLES l V. STONE.

\Vitnesses:

EDWARD W ILLIAMS, J r. HELEN ORFoRn.

